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Pans in the Southern Great Plains Soils. II. Effect of Duration of Radial Root Restriction on Cotton Growth and Yield¹

Synopsis: A restriction of 0.79 cm. or less for a period of 2 weeks or more on cotton roots reduced lint yield. All plants restricted to 0.32 cm. for 6 weeks or more died. Many plants died when restricted to 0.32 cm. for 4 weeks or' 0.48 cm. for 6 weeks, and the lint yield was very low on the plants that remained. Plant height was reduced by 0.32- and 0.48-cm. restrictions of 4 weeks or more duration. On plants that were not killed, the part of the plant where the clamp was removed grew larger than was normal on check plants.

² Research Soil Scientist, Bushland, Texas, and Physical Science Technician, Chickasha, Oklahoma.

Received for publication September 23, 1963.